Shortly after 7PM on the 13th of May DC police (MPD) fired an LRAD "long range accoustic device" or sound cannon at the Embassy of Venezuala. Weeks of siege of not taken the embassy for Trump-supported, failed coup plotter, self-declared "President" Juan Guaido. Police have this begun a raid on the embassy.
The "LRAD" seen in this clip (assuming it is the source of the sound) does not look like a normal LRAD, which has a flat panel that
works as an array of many small "tweeter" speakers playing an
ultrasonic tone around 100khz which when modulated like an AM radio will
create sounds in human ears present in a very narrow beam. Rather, MPD
is playing either an LRAD's electronics or just a recording of an LRAD
with a conventional amplifier into a single high-frequency capable
loudspeaker. Unknown if this device is capable of the 100khz ultrasonic
emission of a true LRAD or not.
Unknown who shot the footage this was cut from and zoomed in on, please comment if you shot this so the "Creator" field can be updated